Long Term Bistable Twisted Nematic Liquid Crystal Display and Its Computer Simulations

Abstract

The multidimensional alignment (MDA) technique realized by the polymer wall has been previously proposed as a means to stabilize the liquid crystal configurations for twist angles of 0 and 2π so that very low power and real bistable twisted nematic (BTN) liquid crystal display (LCD) can be obtained. In this study, a two-dimensional liquid crystal director simulation software was employed to explore the stability of BTN devices. The simulation results showed that the homeotropic aligned polymer wall will stabilize the BTN device when the ratio of d/p is close to the switching d/p ratio, but when the d/p ratio is higher than 0.9, the director field will convert the configuration from a high-energy 0 twist state to low-energy 2π twist state automatically, therefore the BTN bistability will be destroyed.